Education 299: Raspberry Pi Training Mike Davis – Truman College 5/19/2015

Welcome! This professional development workshop is for educators who are looking for an opportunity to integrate new technology into the classroom. You will learn how to: Use your Raspberry Pi remotely Find it on a network Use it to control a camera Use it to host a local web page

Goals for Today Plug in and access your Raspberry Pi Load the Raspian Wheezy Operating System Play with the OS and get comfortable with the command line Determine the IP address of the Raspberry Pi Connect the camera and take pictures Retrieve pictures from the Raspberry Pi Use a python program to take a time lapse. Use cron to schedule a timelapse.

What is the Raspberry Pi? Description Designed by Eben Upton with an emphasis in computer programming. Small computer, runs on Linux. Very small power draw (1.21 Watts) 40 GPIOs 4 USB Ports HDMI output 3.5mm jack Micro USB for power Ethernet plug-in Raspberry Pi

Plug it in! Connections Plug in the HDMI cable / Pi-View Plug in the USB Devices Keyboard Mouse Wireless dongle Plug in the Ethernet cable. Plug in the power (last) Should Look a bit like this

What you should see What you are doing We have modified SD cards that have the Raspian Wheezy OS. It will load the Raspian image directly, and quickly. This is the operating system for the computer. Login = pi Password = raspberry Look a little like this

Access the Graphical User Interface (GUI) What you are doing At the command line type startx This will start the graphical user interface for the RPi. Its like seeing the windows desktop. Look a little like this

Play Around in the GUI Goals Find the web browser Open Scratch Find the wireless configuration Find the terminal

Play Around in the Terminal Terminal Commands CommandEffect pwdShows you the present working directory mkdir nameMakes a directory cd nameChanges the directory cd..Moves back one level in the directory cd ~Moves to the home directory lsLists the contents of the directory. sudoSuper User Do Common Linux Commands

Make a Directory to Put Pictures In Instructions Command cd ~ mkdir camera Reason We will plug in the camera and start taking pictures. We will have to tell the camera where those pictures should be stored. We will want to access those pictures from another computer.

File management – Prepare to take pictures You may want to set up a folder to store the pictures you are taking. If the goal is to take a picture and put it in file, that goes in to the command. raspistill –o /home/pi/camera/picture.jpg CommandEffectExample pwdPresent working directory, where you currently are. mkdirMake a new foldermkdir camera cdChange directorycd camera cd..Return to previous directorycd.. cd /home/pi/cameraGo to a specific directorycd /home/pi/camera lsList contentsls

Helpful Video for Plugging in the Camera Lift up the small black guide by the Ethernet port. The small electrical contacts on the ribbon face the end with the power cord. Avoid any kind of static or sparks. Plug in, turn on the Rasberry Pi after it is connected.

Configure the Camera You may need to configure the camera. sudo raspi-config Select Enable Camera and then Finish. You will be asked to reboot. Go ahead. This only needs to be done once. Camera Specs 5 M Pixel Video Mode – 1080p30, 720p60, and 640x480p60/90 Full Frame SLR Lens Eq. – 35mm Fixed Focus – 1m to infinity F-Stop – 2.9 Focal length – 3.60mm Can do up to 90 frames/second Full Specs

Lets take a selfie. From the command line use this script raspistill –o picture.jpg This tells the computer to use a program called raspistill and output (o) a file called picture.jpg With the default settings this will be a 2.4MB file.

Raspistill has a lot of customizable commands EffectCommandDefault Preview-pTRUE No Preview-nFALSE Sharpness-sh0 Contrast-co0 Brightness-br0 Horizontal Flip-hfFALSE Vertical Flip-vfFALSE Shutter Speed-ssN/A Up to 6s Sample commands Flips the image raspistill –vf -hf –o picture.jpg Increase the contrast raspistill –co 50 –o picture.jpg Complete list

Raspistill Image Effects EffectCommand Negative-ifx negative Solarise-ifx solarize Sketch-ifx sketch Oilpaint-ifx oilpaint Watercolour-ifx watercolour Film-ifx film Try various image effects. Save each image separately. Save over individual images. Complete list

How to do time lapse photos 1.Make sure you have a folder you want to save everything to. 2.Type the command raspistill –o /home/pi/camera/picture%03d.jpg –tl –t ProgramOutput destination and file name. 3 digit number to appear after camera (001, 002, 003, etc) Time lapse in milliseconds between pictures Total time in milliseconds for all pictures

The End Product

Things to think about with time lapse projects What is something that will change slowly but dramatically? Seedlings Crystals Bacterial growth Decay How often will you need to take pictures? How much space will you need for those pictures? What can I control? Lights Power

Camera Takes Video Too Raspivid The camera can also take video. Use it to take slow motion video with a high frame rate. Up to 90 frames per second depending on the resolution. Video Made in my Lab

How to do videos 1.Make sure you have a folder you want to save everything to. 2.Type the command Raspivid –w 640 –h 480 –fps 90 –t –o /home/pi/camera/movie.h264 Program Width and height of the image Length of video in milliseconds Output location Frame speed

Now lets get those pictures/files On your Raspberry Pi Determine the IP address sudo ifconfig On your preferred computer Make sure you are on the same network as the Raspberry Pi. Download WinSCP This is a program that will enable File Transfer Protocol between your computer and the Pi. Very user friendly interface.

Local computer on the left, remote computer (RPi) on the right.

Got a lot of photos, how do I make a time lapse movie? Download Cineform – GoPro StudioLight, free video editing Import all photos. Since they are ordered sequentially, they will be in time order. Go on to step 2, and step 3. Export as a AVI or MP4 or… Enjoy your movie!

Get clever Use other things as lensesDye them

Lots of ways to skin a cat. Can I use Dropbox? You can, and its pretty easy. Instructions Requirements Dropbox account Developer access Benefits You can automatically upload files to Dropbox. You can have a Python program take pictures and send them to Dropbox. Check on your photos from anywhere. Can I use a Python program You can, and build it to your needs. Instructions Requirements A little programming experience, but not much. Benefits You can tell your computer to take pictures in the way you want, when you want.

Potential Projects / Asks Make a Photobooth that will take a picture when a button is pushed, and it to the user. Example Take a picture of something at the same time everyday. Start taking time lapse photos at the same time everyday and upload them to Dropbox or a remote server at the end of the day. Take video with the Raspberry Pi Camera Example Control the Raspberry Pi Camera from another computer. Example Control the Raspberry Pi Camera from your phone. Example

Assignment – Due Friday by Midnight Come up with and document a Project for your camera. More than taking a single picture. Use the camera to show something changing, or happening quickly. Use the settings on the camera to showcase something interesting. Describe how you completed your project. Create a set of teacher notes for your project. These will be shared with the STEM Community.